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<?php class ArrayObjectChild extends ArrayObject { public function offsetExists($offset) { var_dump('Called: '.__METHOD__); return parent::offsetExists($offset); } public function offsetGet($offset) { var_dump('Called: '.__METHOD__); return parent::offsetGet($offset); } } class ArrayAcessImplementation implements ArrayAccess { private $_array = array(); public function __construct(array $array) { $this->_array = $array; } public function offsetExists($offset) { var_dump('Called: '.__METHOD__); return array_key_exists($offset, $this->_array); } public function offsetGet($offset) { var_dump('Called: '.__METHOD__); return $this->_array[$offset]; } public function offsetSet($offset, $value) {} public function offsetUnset($offset) {} } $array = array('foo' => ''); echo "ArrayObject: empty string is set, but empty:\n"; $object = new ArrayObject($array); var_dump(isset($object['foo']), empty($object['foo'])); echo "ArrayObject extended: empty string is set, but not empty\n"; $object = new ArrayObjectChild($array); var_dump(isset($object['foo']), empty($object['foo'])); echo "ArrayAccess implemented: empty string is set, but empty\n"; $object = new ArrayAcessImplementation($array); var_dump(isset($object['foo']), empty($object['foo']));
Output for 5.6.0 - 7.1.0
ArrayObject: empty string is set, but empty: bool(true) bool(true) ArrayObject extended: empty string is set, but not empty string(38) "Called: ArrayObjectChild::offsetExists" string(38) "Called: ArrayObjectChild::offsetExists" string(35) "Called: ArrayObjectChild::offsetGet" bool(true) bool(true) ArrayAccess implemented: empty string is set, but empty string(46) "Called: ArrayAcessImplementation::offsetExists" string(46) "Called: ArrayAcessImplementation::offsetExists" string(43) "Called: ArrayAcessImplementation::offsetGet" bool(true) bool(true)
Output for 5.2.2 - 5.5.38
ArrayObject: empty string is set, but empty: bool(true) bool(true) ArrayObject extended: empty string is set, but not empty string(38) "Called: ArrayObjectChild::offsetExists" string(38) "Called: ArrayObjectChild::offsetExists" bool(true) bool(false) ArrayAccess implemented: empty string is set, but empty string(46) "Called: ArrayAcessImplementation::offsetExists" string(46) "Called: ArrayAcessImplementation::offsetExists" string(43) "Called: ArrayAcessImplementation::offsetGet" bool(true) bool(true)
Output for 5.2.1
ArrayObject: empty string is set, but empty: bool(true) bool(true) ArrayObject extended: empty string is set, but not empty string(38) "Called: ArrayObjectChild::offsetExists" string(38) "Called: ArrayObjectChild::offsetExists" bool(false) bool(true) ArrayAccess implemented: empty string is set, but empty string(46) "Called: ArrayAcessImplementation::offsetExists" string(46) "Called: ArrayAcessImplementation::offsetExists" string(43) "Called: ArrayAcessImplementation::offsetGet" bool(true) bool(true)
Output for 5.1.0 - 5.2.0
ArrayObject: empty string is set, but empty: bool(true) bool(false) ArrayObject extended: empty string is set, but not empty string(38) "Called: ArrayObjectChild::offsetExists" string(38) "Called: ArrayObjectChild::offsetExists" bool(true) bool(false) ArrayAccess implemented: empty string is set, but empty string(46) "Called: ArrayAcessImplementation::offsetExists" string(46) "Called: ArrayAcessImplementation::offsetExists" string(43) "Called: ArrayAcessImplementation::offsetGet" bool(true) bool(true)
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_ARRAY, expecting '&' or T_VARIABLE in /in/PQbCm on line 21
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/PQbCm on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/PQbCm on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/PQbCm on line 5
Process exited with code 255.